DairyCreamer
Registered User
20/15 is better than 20/20.
It means that at 20 feet, you can distinguish what a letter is at 20 feet, where a normal person would need 15 feet of distance to read it.
20/20 is "average"
20/40, say, is that you need 20 feet to distinguish a letter where an "average" person would need only 40 feet.
~Nate
It means that at 20 feet, you can distinguish what a letter is at 20 feet, where a normal person would need 15 feet of distance to read it.
20/20 is "average"
20/40, say, is that you need 20 feet to distinguish a letter where an "average" person would need only 40 feet.
~Nate
Thisguy said:I believe 20/15 is better than 20/20.